Ojalá el socorrista no tenga que avisarnos otra vez y podamos dar un chapuzón tranquilas antes de cenar.

Because ojalá normally triggers the subjunctive when you are expressing a wish or hope about the present or future.

So:

• Ojalá ... tenga ... = I hope ... doesn’t have to ...
• y podamos ... = and that we can ...

Even though ojalá only appears once, it applies to both verbs joined by y. So both actions are part of the same wish.

Ojalá means something like:

• I hope
• Hopefully
• If only

In this sentence, it expresses a hope about the future, so Spanish uses ojalá + present subjunctive:

• Ojalá venga = I hope he/she comes
• Ojalá no llueva = I hope it doesn’t rain

It is a very common word in Spanish for expressing wishes.

It comes from tener que + infinitive, which means to have to do something.

Base structure:

• tener que avisar = to have to warn / tell

In the sentence, tener is in the subjunctive:

• tenga que avisarnos = has to warn us / has to tell us

With the negative:

• no tenga que avisarnos otra vez = doesn’t have to warn us again

Because object pronouns in Spanish can attach to an infinitive.

So both of these are possible in many contexts:

• avisarnos
• nos avisar → this one is not correct here on its own after que; with a conjugated verb you would say nos avise

What is happening here is:

• avisar = to warn / inform / tell
• nos = us
• avisarnos = to warn us / to tell us

Attaching the pronoun to the infinitive is very normal after structures like tener que:

• tengo que llamarte
• tenemos que irnos
• no tenga que avisarnos

Here avisar most likely means to warn or to tell.

With a lifeguard, the idea is probably that the lifeguard has already had to speak to them, caution them, or call their attention to something. So in natural English, depending on context, you might translate it as:

• warn us
• tell us
• call out to us
• remind us

So avisarnos otra vez suggests the lifeguard has already had to intervene before.

In Spain, socorrista very commonly means lifeguard, especially at a beach or swimming pool.

In other contexts it can refer more generally to a rescuer or emergency helper, but here lifeguard is clearly the natural meaning.

Dar un chapuzón is an idiomatic expression meaning:

• to have a dip
• to take a quick swim
• to go for a splash

Literally, it is something like to give a plunge, but that is not how you would translate it naturally.

It is different from nadar:

• nadar = to swim
• dar un chapuzón = to go in the water briefly / have a dip

So this sentence is not necessarily about serious swimming. It suggests a casual, pleasant dip before dinner.

Because tranquilas is an adjective describing the people speaking, not an adverb describing the action.

It agrees with the implied subject:

• podamos dar un chapuzón tranquilas

This means something like:

• so that we can have a dip in peace
• so that we can have a relaxed dip

The form tranquilas tells you the speakers are feminine plural, so the implied subject is nosotras.

If the group were masculine or mixed, it would be:

• tranquilos

If you used tranquilamente, that would mean calmly / peacefully as an adverb, but that is not the structure used here.

Yes, most likely.

Spanish adjectives agree in gender and number with the people they describe:

• tranquilo = masculine singular
• tranquila = feminine singular
• tranquilos = masculine plural or mixed group
• tranquilas = feminine plural

So podamos dar un chapuzón tranquilas strongly suggests the speakers are a group of women or girls.

Because Spanish normally uses preposition + infinitive when the subject is the same.

Here, the people who want to have a dip are also the ones who will have dinner, so:

• antes de cenar = before having dinner / before dinner

If the subject changed, Spanish would usually use antes de que + subjunctive:

• Antes de que cenemos, llegará Marta
• Antes de que ellos cenen, vamos a nadar

So antes de cenar is the most natural choice here.

Otra vez means again.

So:

• avisarnos otra vez = warn us again / tell us again

It suggests repetition: the lifeguard has already had to say something before, and the speaker hopes it will not happen again.

In many contexts, otra vez and de nuevo are similar:

• otra vez = again
• de nuevo = again / anew

But otra vez is especially common in everyday speech.

El socorrista means the lifeguard, so it refers to a specific, identifiable person — probably the lifeguard at the beach or pool where they are.

Spanish often uses the definite article when both speaker and listener know which person is being talked about.

If it were un socorrista, it would mean a lifeguard, with a less specific sense.

Because Spanish often omits subject pronouns when the verb ending already shows who the subject is.

Here:

• podamos = we may/can in the subjunctive

So Spanish does not need nosotros or nosotras unless the speaker wants emphasis.

The full version could be:

• Ojalá ... y nosotras podamos dar un chapuzón ...

But that would usually sound unnecessary unless you want contrast or emphasis.

Grammatically, you can trace the pieces that way, but it would not be natural English.

More natural translations would be:

• Hopefully the lifeguard won’t have to warn us again and we can have a peaceful dip before dinner.
• I hope the lifeguard doesn’t have to tell us off again and we can have a quick dip in peace before dinner.

That is a good example of why Spanish often needs to be translated by meaning, not word-for-word.